Tool for fastening metal tooth-backings.



G. 0. BURLEW.

TOOL FOR PASTBNING METAL TOOTH BAGKINGS.

APPLICATION FILED MAY 24, 1012.

1,085,855. Patented Aug. 20, 1912.

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GILDEROY O. BURLEW, 0F NEWARK, NEW JERSEY.

TOOL FOR FASTENING METAL TOOTH-IBACKINGS.

Specification of Letters Patent.

Application filed May 24, 1912.

Patented Aug. 20, 1912.

Serial No. 699,537.

To all whom t may concern:

Be it known that I, G'ILDnnoY O. BURLEW, a citizen of the United States,residing at Newark, in the county of Essex and State of New Jersey, haveinvented certain new and useful Improvements in Tools for FasteningMetal Tooth-Backings; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

The present invention relates to an improved tool for rapidly spinningand compressing metal sheets around the pins or spikes by which they areoften united to artiticial teeth when preparing a metal backing for suchteeth.

The principal advantage of my improvement is found in its providing asimple and easily operated tool whereby a rotative twist can be given tothe gold leaf while compressing it around the pins in forming a joint,which will prevent all possibility of leakage around the pins.

The nature of the invention is made clear in the accompanying drawings,wherein Figure 1 is a longitudinal section of the tool, Fig. 2 is atransverse section on the line X--X in Fig. 1, and Fig. 3 shows theeffect of the tool in joining to the fastening of an artificial tooth asheet of gold shown in section therein.

In applying a porcelain facing 10 to certain dental Structures in a wellknown manner, it is a common practice to supply a gold sheet 11 betweensuch facing and the structure to which it is applied, and it isimportant that the apertures through which pass the sharp pins 12, usedin supporting the facing itself, Should tit so tightly and permanentlyaround the pins as to prevent all leakage around the pins.

It is the object of the present invention to provide a tool which willquickly and effectually make a joint of this character.

Within the hollow shell 13, closed by a cap 14, preferably screwing intosaid shell as shown, a core 15 is mounted so as to be capable ofreciprocating movement within the shell. The core 15 is preferablyhollow, to accommodate a spring 16 on a guiding pin 17, which springnormally holds the core in the extended position shown in Fig. 1. Thecore carries an external spiral groove 18 of long pitch into which thereprojects a pin 19, so that, when the core reciprocates with relation tothe outer handle or shell, it also takes on a rapid rotary movement. Thecore comprises an extension, marked 20 in Fig. 1, which passes throughan appropriate opening in the cap 14, and carries at its extremity aspinning tool having a deep terminal cavity of appropriate shape, 22, ofsuch a size as to receive and admit one of the pins 12 and the thinlayer of gold pushed up around its base when the pin is thrust throughthe sheet of gold 11. The opening of the cavity 22 should be roundedinward and present no sharp edge or projection which might cut or piercethe gold.

In using this tool, the sheet is laid upon soft wood or other suitablematerial and the pins 12, carrying the facing 10, are pushed through thegold, until the sheet lies flat against the back of the facing. Theopening 22 in the spinning tool 21 is then placed over each pin and thegold pushed up around it, and the handle or shell 13 is moved up anddown. On each downward movement the tool 21 twists the gold sheet neatlyaround the pin, and then consolidates the same in a single mass in amanner familiar, so far as the consolidation is concerned, in ordinarygold fillings for teeth. To facilitate this operation, I prefer to makethe shell 13 fairly heavy, so as to produce a hammer efl'ect.

That I claim is- 1. A tool for producing non-leaking joints where pinsproject through a metal tooth backing in dental work comprising incombination, a handle or shell, a core mounted so as to reciprocatewithin said handle or shell, means for producing rotary motion of saidcore when the shell is reciprocated, and a spinning tool at theextremity of the core having a suitably shaped deep cavity adapted totit over one of said pins and the metal backing plate around the basethereof, substantially as described.

2. A tool for producing non-leaking joints where pins project through ametal tooth backing in dental work comprising in combination, a handle,or Shell, a core mounted so as to reciprocate within said handle orshell, and having a spiral external groove, a projection in the shellentering said groove, an extension on said core, and a spinning tool onthe extremity of said extension provided with a deep cavity of suitableshape, adapted to fit over one of said pins and the metal backing platearound its base, substantially as described.

3. A tool for producing non-leaking oints where pins project through ametal tooth backing in dental Work comprising in comloination7 a handleor shell, a core mounted so as to reciprocate Within said handle orshell, and having a spiral external groove, a proj ection in thevshellentering said groove, a spiral spring and a guide therefor Within Saidshell entering an appropriate cavity in said core, an extension on saidcore and a spinning` tool on the extremity of said extension providedwith a deep cavity of suitable shape, adapted to fit over one of saidpins and the metal backing plate around its base, Substantially asdescribed.

In testimony whereof, I atiix my signature, in presence of twoWitnesses.

GILDEROY O. BURLEW.

Vitnesses H. S. MACKAYE, KATHARINE C. MEAD.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, Il. C.

